If TurboTax is giving you a duplicate error you can try deleting your state return and start again. This often helps resolve the duplicate error. You can do this by selecting State Taxes from Tax Home.
On the Status of your state returns screen, select the trash can icon next to your state, then select Delete. Here is the link with those instructions.
This may also be helpful, here is a link on how to e-file your state return after having already filed your federal return.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"